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PROCUREMENT OPPORTUNITY

London Underground Central Line Audible Alarm Unit - Design & Replacement of Combined Power Supply / Power-Amplifier Printed Circuit Board

Transport for London · Preliminary market engagement notice on Find a Tender

Tender information last checkedLast checked 30 Sept 2026, 09:06.

Opportunity overview

Scope Description The proposed tender is intended to secure LUL 92TS Central Line Audible Alarm Unit (AAU) - Design & Replacement of Combined Power Supply (PSU)/ Power-Amplifier Printed Circuit Board (PCB) updates required on the 1992 Tube Stock (92TS) Central Line of the Preliminary Market Engagement document. Context: TfL is exploring market interest and capability for remediation of 92TS Audible Alarm Units (AAU) by replacing the combined Power Supply Unit (PSU)/Power Amplifier Printed Circuit Board (PCB) inside each AAU, carrying out required factory and site testing, and returning fully functional AAUs for service. The AAU comprises two internal boards -   Combined PSU/Power-Amplifier PCB  Voice synthesis PCB  Failures have occurred exclusively on the Power Supply Unit (PSU)/Power-Amplifier PCB, which is no longer supported by the Original Engineering Manufacturer (OEM). Given the AAU's safety-critical function, trains cannot operate without it, making obsolescence remediation essential.    TfL intends to proceed in phases:  Phase 1 - Development of 2 prototype combined PSU/Power-Amplifier PCB units (PCB design validation, Final Acceptance Testing (FAT) and Site Acceptance Testing (SAT))  Phase 2 - Production of 18 units of combined PSU/Power-Amplifier PCB subject to prototype approval.  Phase 3 - Potential Future Demand (option) - up to 180 additional combined PSU/Power-Amplifier PCB units  Objective: Identify suppliers with capability to design, replace, and test PSU/Power-Amplifier PCBs within existing AAU housings, while maintaining fit, form, and function equivalence. Understand supplier approaches to obsolescence management, aiming for 15-20 years of ongoing support. Assess capacity to deliver through a phased model: prototypes, batch production, and potential scaling. Evaluate supplier test and assurance capability, including: Final Acceptance Testing (FAT) Site Acceptance Testing (SAT) Compliance with RIA 12 and EN 50121-3-2 (EMC), and BS EN 61373 Cat 1, Class B (shock & vibration). Gain insight into market best practice for low-volume, safety-critical electronics.

Classification

  • CPV31720000 — Electromechanical equipment
  • CPV35121700 — Alarm systems
  • CPV50222000 — Repair and maintenance services of rolling stock
  • CPV60210000 — Public transport services by railways

Lots

  • Lot 1Value not stated

Documents and notices

Published notice details

Additional information from the published procurement release. Fields appear only when supplied by the source; check the original notice and tender documents before acting.

Scope, procedure and submissions

Id
WS2683802782
Status
planning
Above Threshold
No
Main Procurement Category
goods

Legal basis

Id
2023/54
Scheme
UKPGA

Communication

Future Notice Date
2 Oct 2025, 23:59

Special regime

utilities

Lots and requirements

Entry 1
Id
1
Status
planning

Contract period

Ends
31 Mar 2028, 23:59
Starts
1 Apr 2026, 00:00

Items and delivery

Item 1
Id
1
Related Lot
1

Delivery locations

Entry 1
Region
UKI
Country
GB
Country Name
United Kingdom

Additional Classifications

Entry 1
Id
31720000
Scheme
CPV
Description
Electromechanical equipment
Entry 2
Id
35121700
Scheme
CPV
Description
Alarm systems
Entry 3
Id
50222000
Scheme
CPV
Description
Repair and maintenance services of rolling stock
Entry 4
Id
60210000
Scheme
CPV
Description
Public transport services by railways

Planning and budget

Documents

Entry 1
Id
056351-2025
Format
text/html
Notice Type
UK2
Description
Preliminary market engagement notice on Find a Tender
Document Type
marketEngagementNotice
Published
12 Sept 2025, 16:41

Milestones

Entry 1
Id
engagement
Type
engagement
Status
scheduled
Due
2 Oct 2025, 23:59
Description
Engagement process description Please email HaliseAkkaya@tfl.gov.uk to request and complete the Preliminary Market Engagement Document. Please answer all questions and send your completed questionnaire by email to the Procurement Manager, Halise Akkaya ( HaliseAkkaya@tfl.gov.uk ) before 17:00 GMT on 2nd October 2025. Late Responses will not be considered. Non-responses to this expression of interest will be deemed as not interested. If bidders do not choose to participate in the Early Market Engagement process, this will not affect the ability to participate in the tender, if Expression of Interest to participate in the tender is received by the closing date. Your answers will be treated as TfL restricted in accordance with TfL standard S1782. Information security classification. This means that your answers will only be visible to people authorised by TfL, typically only the TfL staff involved in the procurement.

Buyer, suppliers and contacts

Organisation 1
Id
GB-PPON-PHMT-6197-NWNZ
Name
Transport for London

Roles

buyer

Address

Region
UKI41
Country
GB
Locality
London
Postal Code
E20 1JN
Country Name
United Kingdom
Street Address
5 Endeavour Square

Details

Classifications

Entry 1
Id
publicAuthorityCentralGovernment
Scheme
UK_CA_TYPE
Description
Public authority - central government

Identifier

Id
PHMT-6197-NWNZ
Scheme
GB-PPON

Contact

Recorded locations

  • Buyer location · London · UKI41 · E20 1JN · United Kingdom
  • Delivery location · UKI · United Kingdom

Notice and amendment history

1 published notice version reviewed by ProcuraAxis.

1 VERSION
  1. ocds-h6vhtk-0599c0-2025-09-12T16:41:40+01:00Preliminary market engagement notice on Find a Tender ·